Need a new graphics card

[Ferrier]

I don't really know much about computer hardware, so really need some help with figuring out what I need for my computer.

The exact comp I'm using is

http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01643511&lc=en&dlc=en&cc=us&product=3856272&lang=en#N77

It has

Integrated nvidia GeForce 9100
Phenom X4 9550
6GB Memory
640 Gb hard drive
300W psu

There are a few new games coming out soon that I'm wanting to play and it appears that I may need a new graphics card but really have no knowledge of such things. I'd like to be able to find a card that will work with the other hardware that I have without having to upgrade more. The games i'm wanting to play are SWTOR and the new Diablo game when it comes out, just to give you an idea of what Im looking for.

 

[amuffin]

A completely new system would be the best option.

 

[Ferrier]

lol I would if I could, not possible at the moment though